Exchange Script to splice in historical LEDN onto migrated mailboxes, to support reply-to etc on PST migrated email.

append-x500LEDN-ToMbxEmailAddressess.ps1

# append-x500LEDN-ToMbxEmailAddressess.ps1

<# key snippet from larger script...#>

if(test-path $InputCSV) {
    write-verbose -verbose:$true  "$((get-date).ToString('HH:mm:ss')):Loading Input file: $($InputCSV)" ;
    $procMbxs=import-csv $InputCSV ; 
    foreach($pMbx in $procMbxs) {
        if($tmbx = get-mailbox -identity "$($pMbx.WindowsEmailAddress)" -ea 0 ){
            write-host -foregroundcolor green  "$((get-date).ToString('HH:mm:ss')):MATCHED:$($pMbx.WindowsEmailAddress)($($pMbx.displayname))=>TO:$($tmbx.WindowsEmailAddress)($($tmbx.displayname))" ; 
            $x500LEDN = "X500:" + $pMbx.LegacyExchangeDN ; 
            if ($tmbx.EmailAddresses -notcontains $x500LEDN) {
                write-host -foregroundcolor green "$((get-date).ToString('HH:mm:ss')):WHATIF:$($whatif):Adding LEDN as X500: `n$($x500LEDN) `nto existing emailaddresses:`n$($tmbx.emailaddresses)" ; 
                set-mailbox -identity $pMbx.WindowsEmailAddress -EmailAddresses @{Add=$x500LEDN} -whatif:$($whatif); 
            } else {
                write-host -foregroundcolor green "$((get-date).ToString('HH:mm:ss')):SKIPPING:Mailbox $($tmbx.windowsemailaddress) already contains $($x500ledn)" ; 
            } ; 
        } else {
            write-host -foregroundcolor red  "$((get-date).ToString('HH:mm:ss')):UNABLE TO MATCH:$($pMbx.WindowsEmailAddress)($($pMbx.displayname))" ; 
        }  ; 
        "===========`n" ; 
    } ; 

} else {
    write-host -foregroundcolor red  "$((get-date).ToString('HH:mm:ss')):MISSING InputCsv:$($InputCSV)" ; 
} ;